Robert S. Crawford

Sinclair Community College · Department of Geology

Examination of all known specimens of decapod crustaceans from the Fox Hills Formation has resulted in recognition of five species and three distinctly different forms of pereiopods that cannot be assigned to a recognized taxon with certainty. Callichirus waagei n. sp. is proposed for a callianassid claw preserved within an Ophiomorpha burrow. Hopl...

Four exposed planar surfaces within the type area of the Monte León Formation (early Miocene) of southern Patagonia, Argentina, enclose significantly different fossil assemblages positioned in close geographic and stratigraphic proximity to one another. The exposed paleosurfaces were mapped in planar view using a quadrat grid system. Precise fossil...

A previously undescribed fossil specimen of deep water crab belonging to the family Homolidae de Haan, 1839 was discovered in the collection of the Museo Paleontologica de Bariloche of Rio Negro Province, Argentina. The specimen is exceptional because one of the extra-lineal flanks is present. These lateral portions of the carapace are often absent...

ABSTRACT--Although some colony morphology is obtainable from fragmentary material, study of complete or mostly complete colonies is the only way to fully resolve the morphologies of complex trepostome bryozoans. The reconstruction herein ofHeterotrTpa sp. revealed a radially expanding zoarium of ten vertical blades that each form a series of paired...

Epibionts on both living and fossil decapod crustaceans may serve as valuable proxies for paleoecological factors such as behavior and environment. Prevalence of epibionts, as observed primarily on the carapaces of fossil brachyurous decapod crustaceans, appears to be less than observed on living crabs, based upon observations in the literature, an...